HCS1 Three-Axis Helmholtz Coil System

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Charlene Singleton
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1 HCS1 Three-Axis Helmholtz Coil System Innovation in Magnetic Measuring Instruments

HCS1 Three-Axis Helmholtz Coil System HCS1 Three-Axis Helmholtz Coil System The system consists of three pairs of coils (HC1) and a drive amplifier (PA1) that generate a magnetic field of known

1% homogeneous field of 4.5cm 3. A mounting table is provided to hold the test item inside the homogeneity volume. A unit (CU1) can be supplied to control the system using LabVIEW -based software.

2 HCS1 Three-Axis Helmholtz Coil System HCS1 Three-Axis Helmholtz Coil System The system consists of three pairs of coils (HC1) and a drive amplifier (PA1) that generate a magnetic field of known frequency and intensity, up to 500μT per axis for a DC field and up to 100μT for a 5kHz field. Running from a standard single phase AC line supply, the 40cm diameter coils produce a 0.1% homogeneous field of 4.5cm 3. A mounting table is provided to hold the test item inside the homogeneity volume. A unit (CU1) can be supplied to control the system using LabVIEW -based software. It can be offered with a National Instruments PXI system which allows the user to set the field, set any DC compensation as required and receive feedback from the coils. This control unit takes inputs from any Bartington Instruments magnetometer to provide a reference reading of the local magnetic field. Inputs can also be taken from the coil current and from a spare magnetometer if required. It can also be offered with a PCI card that will allow it to be connected to an existing PC. Features Field generated in three axes, up to 500μT per axis for DC and 100μT at 5kHz Separate System Control Unit (CU1) available Current monitor output Applications Calibration of three-axis magnetic field sensors Cancellation of magnetic fields Creation of a known magnetic environment

3 HC1 Coil and PA1 Amplifier Specifications Performance Number of axes 3 Parallelism ± 1 (electronic adjustment possible to <0.1 ) Orthogonality to datum ± 1 (electronic adjustment possible to <0.1 ) Mounting to datum 3 points with orthogonality error <0.1 (electronic adjustment possible to <0.05 ) Maximum field generated Supply >150V Supply <150V Scaling error ± 0.25% Temperature coefficient of scale factor Linearity error ± 500µT at DC per axis; ± 100µT at 5kHz; total 900µT for three axes together ± 500µT at DC per axis; ± 100µT at 5kHz; total 750µT for three axes together ± 0.05% / C DC compensation ± 100µT 0.001% (Least Squares Fit) Electrical Amplifier input Input connector Coils output connector Current monitor output Current monitor output connector Power requirement Maximum power 1V/100µT differential Hirose RM15TRD-10S Neutrik Speakon 8 poles 1V/100µT differential Hirose RM15TRD-10P 100V 230V AC, <10A, 50/60Hz 1kW Mechanical Coil dimensions Coil assembly dimensions Coil system volume 0.5m 3 Coil homogeneous volume (<0.1% error) 4.5cm 3 Coil homogeneous volume (<1% error) 165cm 3 Coil gross weight Electronics enclosure dimensions Electronics enclosure gross weight X Coil: nominal diameter 600mm Y Coil: nominal diameter 554mm Z Coil: nominal diameter 508mm Height: 632mm Width: 620mm Depth: 574mm 30kg 6U 19in rack mount box Height: 270mm Width: 510mm Depth: 600mm 59kg Environmental Operating temperature range Storage temperature Operating humidity +15 C to +30 C +10 C to +40 C Up to 90% RH non-condensing

4 HCS1 Three-Axis Helmholtz Coil System CU1 Control Unit Specifications Performance Input channels Magnetometer Input compatible with most Bartington magnetometers with up to 3 axes, differential or single-ended output, dual or single rail Input filters AUX Current sense Compatible with Mag-03 three-axis magnetic field sensors or Mag-03RC range magnetometers, differential or single-ended output Three axis ±10V differential connected to current sense output on Helmholtz drive amplifier Type Butterworth 2-pole 12dB per octave low pass Frequencies (software selectable): 10kHz,1kHz, 100Hz & 10Hz Sensor power output Magnetometer 0 to ±20V programmable, limited to 100mA (compatible with single or dual supply devices) DAC output channels AUX & current sense ±15V limited to 50mA per sensor channel. Power output protected by self resetting semiconductor fuses Three axes ±10V balanced/differential connected to Helmholtz drive amplifier ESD protection Comprehensive ESD surge protection on input and output channels for ESD and lightning protection Electrical Maximum cable length Power supply voltage Power supply current Power input (rear panel) Working signal input voltage Working common mode input voltage Absolute maximum input voltage Input connectors (front panel) Input mating connector Output connectors (front panel) Output mating connector Output connector (rear panel) 20m all inputs and outputs VAC 50/60 Hz 1100 ma (115V) / 640 ma (230V) type 3-way IEC 320 with integral filter (mains cable provided) Up to ±10V differential or single-ended (see above) Up to ±8V: balanced / differential output sensors Up to ±3V: single ended sensors ±15V on any input pin Hirose RM15TRD-10P Hirose RM15TPD-10S Hirose RM15TRD-10S Hirose RM15TPD-10P 2 x 68-way Harting ; interfaces with National Instruments 6289 DAQ card using NI cables SHC68-68EPA Mechanical Dimensions Weight 930 x 575 x 360mm (in wheeled flight case) 46kg (in wheeled flight case) Environmental Operating temperature range Operating humidity Storage temperature +10ºC to +50ºC 0 to 50% RH non-condensing -40ºC to +85ºC

5 PXI Data Acquisition Unit Specifications PXI Cardframe NI PXI-1042* Power supply voltage 100 to 240 VAC 50/60 Hz Power supply current 8A (peak) Power requirement 500W (max) Operating temperature 0 to 55 C Storage temperature -20 to 70 C Operating humidity 10 to 90% RH non-condensing Height 177mm Width 271mm Depth 397mm Weight 8.4kg Processor NI PXI-8106* Processor Hard drive Chipset RAM Ethernet Video Serial Parallel port GPIB Intel Core 2 Duo processor T7400 (2.16 GHz dual core) 60 GB minimum, internal 9.5 mm Serial ATA 1.0 interface Mobile Intel 945GM Express chipset 2 x SO-DIMM sockets, DDR2 SDRAM, PC2 5400, dual channel 512 MB (1 x 512 DIMM) standard, 4 GB (2 x 2 GB DIMMs) maximum 10/100/1000BaseTX, RJ45 connector Intel GMA 950 graphics media accelerator, DVI-I connector RS232 Hi-speed USB 4 IEEE 1284 Type C miniature connector PCI-GPIB/TNT, micro D25 connector PXI-6289 DAQ module* Analogue inputs Analogue outputs 4 Digital output 48 DAC resolution ADC resolution Maximum sampling rate Minimum sampling rate Timing accuracy Timing resolution Input coupling Input range Maximum working voltage for analogue inputs (signal + common mode) Small signal bandwidth ( 3 db) Input FIFO size Scan list memory 16 differential or 32 single ended 16 bits 16 bits expandable to 24 bits by over-sampling 625 MS/s single channel, 500kS/s multi-channel No minimum 50 ppm of sample rate 10ns DC ±10V, ±5V, ±2V, ±1V, ±0.5V, ±0.2V, ±0.1V ±11V of analogue input GND 750 khz filter off, 40 khz filter on 2,047 samples 4,095 entries / continued

6 HCS1 Three-Axis Helmholtz Coil System PXI-6289 DAQ module / continued Overvoltage protection Device ON Device OFF Input current during overvoltage condition ±25V for up to eight analogue input pins ±15V for up to eight analogue input pins ±20mA max / analogue input pin PCI Card Specifications NI PCIe-6353 card* Card type Analogue inputs Analogue outputs 4 Digital output/input 48 DAC resolution ADC resolution Maximum sampling rate Minimum sampling rate Timing accuracy Timing resolution Input coupling Input range Maximum working voltage for analogue inputs (signal + common mode) PCI Express for PC 16 differential or 32 single ended 16 bits 16 bits expandable to 24 bits by over-sampling 1.25 MS/s single channel, 1MS/s multi-channel No minimum 50 ppm of sample rate 10ns DC ±10V, ±5V, ±2V, ±1V, ±0.5V, ±0.2V, ±0.1V ±10V of analogue input GND * See the National Instruments website at for any changes to these specifications.

8 DS2613/3 Bartington Instruments Limited, 5, 10 & 11 Thorney Leys Business Park, Witney, Oxford, OX28 4GE, England. T: +44 (0) F: +44 (0) E: The specifications of the products described in this brochure are subject to change without prior notice. Bartington is a registered trademark of Bartington Instruments Ltd

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